What influence did Byun have on Reaper changes? [closed]

I've heard it a few times over the years by now, by different casters (Lowko likes to mention it a lot): They claim is that that the player Byun was single-handedly responsible for nerfs on the Reaper, due to how well he was able to control them.

My questions generally are: Is that accurate? What changes specifically could be linked to Byun's games (which versions)? Did Blizzard ever hint at him being the reason for a change (I assume they would never directly name a player, but maybe they mentioned something like "due to recent tournament results")? Which games could've been the reason for the changes?

Overall, it just comes across as a very weird claim, that one player alone was the catalyst for a unit nerf - instead of many pro players as a whole. I would like to know where this general idea comes from, or what could've given the impression that Byun was that player.

Perhaps some SC2 tournament historians know more :)